refactor(EditorMap): move leaflet prototype change outside component

Author: philip-cline

lib/editor/components/map/EditorMap.js

@@ -99,6 +99,15 @@ type State = {
   zoomToTarget: boolean
 }
 
+// From https://github.com/Leaflet/Leaflet.draw/issues/695#issuecomment-281663243
+// Prevents creating a new leaflet draw point on drag
+const originalOnTouch = L.Draw.Polyline.prototype._onTouch
+L.Draw.Polyline.prototype._onTouch = function (e) {
+  if (e.originalEvent.pointerType !== 'mouse') {
+    return originalOnTouch.call(this, e)
+  }
+}
+
 export default class EditorMap extends Component<Props, State> {
   state = {
     width: 200,
@@ -122,15 +131,6 @@ export default class EditorMap extends Component<Props, State> {
   componentDidMount () {
     window.addEventListener('resize', this._onResize)
     this.setState({willMount: false})
-
-    // From https://github.com/Leaflet/Leaflet.draw/issues/695#issuecomment-281663243
-    // Prevents creating a new leaflet draw point on drag
-    var originalOnTouch = L.Draw.Polyline.prototype._onTouch
-    L.Draw.Polyline.prototype._onTouch = function (e) {
-      if (e.originalEvent.pointerType !== 'mouse') {
-        return originalOnTouch.call(this, e)
-      }
-    }
   }
 
   componentWillUnmount () {